EP0119004A3 - Ring communications system - Google Patents

Ring communications system Download PDF

Info

Publication number
EP0119004A3
EP0119004A3 EP84300794A EP84300794A EP0119004A3 EP 0119004 A3 EP0119004 A3 EP 0119004A3 EP 84300794 A EP84300794 A EP 84300794A EP 84300794 A EP84300794 A EP 84300794A EP 0119004 A3 EP0119004 A3 EP 0119004A3
Authority
EP
European Patent Office
Prior art keywords
transmit
ring
data rate
terminal
buffer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84300794A
Other versions
EP0119004B1 (en
EP0119004A2 (en
Inventor
Richard G. Bahr
Thomas C. Hogan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Prime Computer Inc
Original Assignee
Prime Computer Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Prime Computer Inc filed Critical Prime Computer Inc
Priority to AT84300794T priority Critical patent/ATE39313T1/en
Publication of EP0119004A2 publication Critical patent/EP0119004A2/en
Publication of EP0119004A3 publication Critical patent/EP0119004A3/en
Application granted granted Critical
Publication of EP0119004B1 publication Critical patent/EP0119004B1/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42—Loop networks
    • H04L12/422—Synchronisation for ring networks

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Small-Scale Networks (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Communication Control (AREA)

Abstract

A ring communications network has a plurality of terminals coupled together to provide a unidirectional communications ring, each terminal being arranged to receive a first digital signal at a data rate associated with the next upstream terminal in the ring and to transmit a second digital signal at a transmit data rate which may be different from the data rate of the received signal. Each signal comprises data packets interleaved with synchronization packets of elastic length to achieve synchronization around the ring. Thus, each terminal has a synchronizing network (12) containing an electric clock generator (32) having a plurality of outputs each shifted in time by a different multiple of 1/8 times the period of a fixed transmit clock signal generated internally by a transmit clock generator (26). In effect, synchronization is achieved by a shallow discretely adjusted delay (FIFO) buffer and sample point readjustment network. The buffer is read at the fixed transmit data rate and loaded at that same rate until the period of elasticity is detected. Then the sample point is reselected to fall in the middle of a transmit bit window effectively changing the FIFO buffer depth.
EP84300794A 1983-02-14 1984-02-08 Ring communications system Expired EP0119004B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84300794T ATE39313T1 (en) 1983-02-14 1984-02-08 RING COMMUNICATION SYSTEM.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US466110 1983-02-14
US06/466,110 US4528661A (en) 1983-02-14 1983-02-14 Ring communications system

Publications (3)

Publication Number Publication Date
EP0119004A2 EP0119004A2 (en) 1984-09-19
EP0119004A3 true EP0119004A3 (en) 1985-11-06
EP0119004B1 EP0119004B1 (en) 1988-12-14

Family

ID=23850511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84300794A Expired EP0119004B1 (en) 1983-02-14 1984-02-08 Ring communications system

Country Status (6)

Country Link
US (1) US4528661A (en)
EP (1) EP0119004B1 (en)
JP (1) JPS59214357A (en)
AT (1) ATE39313T1 (en)
CA (1) CA1212161A (en)
DE (1) DE3475684D1 (en)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4598397A (en) * 1984-02-21 1986-07-01 Cxc Corporation Microtelephone controller
US4755988A (en) * 1983-05-04 1988-07-05 Cxc Corporation Data communications switching device having multiple switches operating at plural selectable data rates
US4597077A (en) * 1983-05-04 1986-06-24 Cxc Corporation Integrated voice/data/control switching system
US4677612A (en) * 1984-02-14 1987-06-30 Rosemount Inc. Communication system with subdivided transmission cycles
US4592044A (en) * 1984-05-22 1986-05-27 At&T Information Systems Inc. Apparatus and method for checking time slot integrity of a switching system
JPS61100046A (en) * 1984-10-22 1986-05-19 Mitsubishi Electric Corp Loop transmission method
EP0245765B1 (en) * 1986-05-14 1993-09-22 Mitsubishi Denki Kabushiki Kaisha Data transfer control system
AU589536B2 (en) * 1986-08-12 1989-10-12 Alcatel N.V. Digital transmission system
BE1000512A7 (en) * 1987-05-07 1989-01-10 Bell Telephone Mfg Switching network.
GB2207327A (en) * 1987-07-22 1989-01-25 Gec Avionics Ring-shaped local area network
US4933955A (en) * 1988-02-26 1990-06-12 Silicon General, Inc. Timing generator
IL96808A (en) 1990-04-18 1996-03-31 Rambus Inc Integrated circuit i/o using a high performance bus interface
US6751696B2 (en) 1990-04-18 2004-06-15 Rambus Inc. Memory device having a programmable register
CA2039059C (en) * 1990-06-14 1997-09-09 Allen Dennis Fergeson Communication network node
US5208809A (en) * 1990-06-14 1993-05-04 At&T Bell Laboratories Communication network node
DE4019536A1 (en) * 1990-06-19 1992-01-02 Siemens Ag CIRCUIT FOR DIGITAL DATA TRANSFER
US5896384A (en) * 1997-02-28 1999-04-20 Intel Corporation Method and apparatus for transferring deterministic latency packets in a ringlet
US6401167B1 (en) 1997-10-10 2002-06-04 Rambus Incorporated High performance cost optimized memory
AU9604698A (en) * 1997-10-10 1999-05-03 Rambus Incorporated Method and apparatus for two step memory write operations
US6263448B1 (en) * 1997-10-10 2001-07-17 Rambus Inc. Power control system for synchronous memory device
WO2001086859A2 (en) * 2000-05-08 2001-11-15 Transilica, Inc. Co-located frequency-agile system and method
TWI243340B (en) * 2004-04-02 2005-11-11 Benq Corp System and method for data synchronization
US8467372B2 (en) * 2010-07-21 2013-06-18 Harris Corporation Wireless communication system with reordering of data symbols and related methods

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2049372A (en) * 1979-05-10 1980-12-17 Gen Electric Repeating station for use in digital data communications link
EP0035789A2 (en) * 1980-03-10 1981-09-16 International Business Machines Corporation Method and arrangement for loop initialization in a peer-to-peer serial loop communication system

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3271688A (en) * 1963-04-17 1966-09-06 Hans W Gschwind Frequency and phase controlled synchronization circuit
FR1482006A (en) * 1966-02-09 1967-05-26 Labo Cent Telecommunicat Improvements in pulse code modulation transmission methods
NL6706736A (en) * 1967-05-13 1968-11-14 Philips Nv
CH550521A (en) * 1972-07-04 1974-06-14 Hasler Ag PROCEDURE FOR MESSAGE TRANSFER BETWEEN PARTICIPANTS.
FR2281686A1 (en) * 1974-08-05 1976-03-05 France Etat DIGITAL TRANSMISSION NETWORK WITH INDEPENDENT TRANSMITTED FRAME PHASES
US3904829A (en) * 1974-09-16 1975-09-09 Control Data Corp Demand driven multiplexing system
US4078228A (en) * 1975-03-24 1978-03-07 Ohkura Electric Co., Ltd. Loop data highway communication system
US3992581A (en) * 1975-09-02 1976-11-16 Sperry Rand Corporation Phase locked loop NRZ data repeater
US4161786A (en) * 1978-02-27 1979-07-17 The Mitre Corporation Digital bus communications system
DE2842371A1 (en) * 1978-09-28 1980-04-10 Siemens Ag METHOD FOR SYNCHRONIZING TRANSMITTER AND RECEIVER DEVICES
JPS5947905B2 (en) * 1980-02-08 1984-11-22 株式会社日立製作所 Information transmission method using a common transmission path

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2049372A (en) * 1979-05-10 1980-12-17 Gen Electric Repeating station for use in digital data communications link
EP0035789A2 (en) * 1980-03-10 1981-09-16 International Business Machines Corporation Method and arrangement for loop initialization in a peer-to-peer serial loop communication system

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 13, no. 7, December 1970, pages 2090-2091, New York, US; W.K. BETTS et al.: "Remote loop attachment" *
IEEE TRANSACTIONS ON COMMUNICATION TECHNOLOGY, vol. COM-16, no. 5, October 1968, pages 633-647, IEEE, New York, US; W. NEU et al.: "Project for a digital telephone network" *

Also Published As

Publication number Publication date
DE3475684D1 (en) 1989-01-19
ATE39313T1 (en) 1988-12-15
CA1212161A (en) 1986-09-30
EP0119004B1 (en) 1988-12-14
EP0119004A2 (en) 1984-09-19
US4528661A (en) 1985-07-09
JPS59214357A (en) 1984-12-04

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